I liked it! I only found out how the portals work through the comments here. The portals could be used as walls, this was a really interesting mechanic and gave time to breathe in such a fast paced environment. The shooting mechanism felt really fun and the different weapons were great.

I think I found a bug. The revolver and the shotgun use all of their ammo in one shot whereas the pistol does not.

Really quite good! Feels great to play

The games initial mechanics of shooting the spirits while having to place down portals in order to gain a score is super fun. The Art also looks really good, fitting in with the music nicely to create a tense yet magical scene. My main issue was that I didn't discover the shop until I got too a score of about 15000, But if you read the How To Play (which I didn't ha...)  you'll pick it up quickly. The weapons all felt really smooth, and the enemy attacks felt incredibly balanced. Overall great game!